计算:(1)8+27-12×6(2)2sin30゜+sin245゜-tan45゜

题型:解答题

问题:

计算:(1)
8
+
27
-
1
2
×
6

(2) 2sin30゜+sin245゜-tan45゜
(3) 解方程:x2-4x+1=0
考点:二次根式的加减乘除混合运算,二次根式的化简一元二次方程的解法特殊角三角函数值
题型:解答题

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-- Hello, this is Susan Wilson. May I speak to Crower please?

-- Hi, Susan. 小题1:

-- Well, I’m calling about the theatre group I belong to.  小题2: And I thought you might be interested.

-- Oh, gosh, you know how much I love acting, but I’m doing a hard job. I might be able to learn my part,  小题3:

-- Well, actually, we practise only one night a week, Thursdays from seven to ten, though we would have to put in extra time before performances.

-- 小题4:   

-- Sure, but look, why don’t you come and watch next Thursday? I think you will like the way we work.   小题5:

-- Okay, I’ll come once, but I can’t promise more than that.

-- Great. I’ll give you a call on Wednesday to remind you. Talk to you then, bye now.

-- Bye, Susan.

A.How are you getting on with your job?

B.but I might have no time to put on performances at the stage.

C.Well, could you give me time to think it over?

D.What can I do for you?E. When you see how much fun it is, you will want to join right away.

F. but I would hardly have time to come to the practice performances.

G. We are looking for more people to join us, especially men.

题型:解答题

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电子吊秤具有正秤和负秤两种功能,当电子吊钩秤使用负秤的功能时,它也可称为()。

A.电子秤

B.卸料秤

C.减料秤

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铁路货车滚动轴承型号为SKF197726且装用LL密封装置时,其运行温升应不大于()℃。

A.40

B.45

C.50

D.55

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